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Tonelli D, Tonelli M, Gianvittorio S, Lesch A. LDH-Based Voltammetric Sensors. MICROMACHINES 2024; 15:640. [PMID: 38793212 PMCID: PMC11123164 DOI: 10.3390/mi15050640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 05/06/2024] [Accepted: 05/08/2024] [Indexed: 05/26/2024]
Abstract
Layered double hydroxides (LDHs), also named hydrotalcite-like compounds, are anionic clays with a lamellar structure which have been extensively used in the last two decades as electrode modifiers for the design of electrochemical sensors. These materials can be classified into LDHs containing or not containing redox-active centers. In the former case, a transition metal cation undergoing a reversible redox reaction within a proper potential window is present in the layers, and, therefore, it can act as electron transfer mediator, and electrocatalyze the oxidation of an analyte for which the required overpotential is too high. In the latter case, a negatively charged species acting as a redox mediator can be introduced into the interlayer spaces after exchanging the anion coming from the synthesis, and, again, the material can display electrocatalytic properties. Alternatively, due to the large specific surface area of LDHs, molecules with electroactivity can be adsorbed on their surface. In this review, the most significant electroanalytical applications of LDHs as electrode modifiers for the development of voltammetric sensors are presented, grouping them based on the two types of materials.
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Affiliation(s)
- Domenica Tonelli
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Via Piero Gobetti 85, 40129 Bologna, Italy; (S.G.); (A.L.)
| | - Matteo Tonelli
- ANRT—Association Nationale de le Reserche et de la Technologie, 33, Rue Rennequin, 75017 Paris, France;
| | - Stefano Gianvittorio
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Via Piero Gobetti 85, 40129 Bologna, Italy; (S.G.); (A.L.)
| | - Andreas Lesch
- Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Via Piero Gobetti 85, 40129 Bologna, Italy; (S.G.); (A.L.)
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Kumari S, Sharma A, Kumar S, Thakur A, Thakur R, Bhatia SK, Sharma AK. Multifaceted potential applicability of hydrotalcite-type anionic clays from green chemistry to environmental sustainability. CHEMOSPHERE 2022; 306:135464. [PMID: 35760140 DOI: 10.1016/j.chemosphere.2022.135464] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 06/04/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
Hydrotalcite-like anionic clays (HTs) also known as Layered double hydroxides (LDHs) have been developed as multifunctional materials in numerous applications related to catalysis, adsorption, and ion-exchange processes. These materials constitute an important class of ionic lamellar solid clays of Brucite-like structure which comprise of consecutive layers of divalent and trivalent metal cations with charge balancing anions and water molecules in interlayer space. These materials have received increasing attention in research due to their interesting properties namely layered structure, ease of preparation, flexible tunability, ability to intercalate different types of anions, electronic properties, high thermal stability, high biocompatibility, and easy biodegradation. Moreover, HTs/LDHs have unique tailorable and tuneable characteristics such as both acidic and basic sites, anion exchange capability, surface area, basal spacing, memory effect, and also exhibit high exchange capacities, which makes them versatile materials for a wide range of applications and extended their horizons to diverse areas of science and technology. This study enlightens the various rational researches related to the synthetic methods and features focusing on synthesis and/or fabrication with other hybrids and their applications. The diverse applications (namely catalyst, adsorbent to toxic chemicals, agrochemicals management, non-toxic flame retardants, and recycling of plastics) of these multifunctional materials related to a clean and sustainable environment were also summarized.
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Affiliation(s)
- Sonika Kumari
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India
| | - Ajay Sharma
- Department of Chemistry, Career Point University, Tikker - Kharwarian, Hamirpur, Himachal Pradesh, 176041, India.
| | - Satish Kumar
- Department of Food Science and Technology, Dr. YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh, 173230, India
| | - Abhinay Thakur
- Department of Zoology, DAV College, Jalandhar, Punjab, 144008, India
| | - Ramesh Thakur
- Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla, Himachal Pradesh, 171005, India
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, 05029, Republic of Korea.
| | - Anil Kumar Sharma
- Department of Biotechnology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India.
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Chu L, Zhang C, Yu J, Sun X, Zhou X, Zhang Y. Adsorption of nitrate from interflow by the Mg/Fe calcined layered double hydroxides. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 86:511-529. [PMID: 35960834 DOI: 10.2166/wst.2022.224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Nitrate loss in interflow caused serious nitrate pollution of neighboring water bodies in the purple soil region of China's Sichuan Province. In this study, Mg/Fe(Al)-calcined layered double hydroxides (Mg/Fe(Al)-CLDHs) with varied Mg/Fe(Al) ratios were synthesized for nitrate removal from interflow, and 3:1 Mg/Fe CLDH exhibited the best adsorption performance. The effects of initial pH, adsorbent dosage and co-existing anions on the adsorption performance were investigated by batch experiments. The best-fitting kinetic and isothermal models for nitrate adsorption were the pseudo-second-order model and Freundlich model, respectively, indicating that the adsorption process was a physical-chemical multilayer process. The maximum adsorption capacity of nitrate was 73.36 mg/g, which was higher than that of many other commonly used adsorbents. The adsorbents were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET) techniques, and the XRD and FT-IR results revealed that the adsorption mechanism involved original layered structure reconstruction and ion-exchange interaction. Under the coexistence of SO42- and Cl-, 75.63% nitrate in interflow could be removed after 6 h of adsorption. Overall, the synthesized Mg/Fe CLDH is an effective and low-cost nitrate adsorbent for in-situ nitrate removal.
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Affiliation(s)
- Liquan Chu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Chaojie Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Jing Yu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Xu Sun
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Xuefei Zhou
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
| | - Yalie Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China E-mail: ; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China
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Mihayo D, Vegi MR, Vuai SAH. Attenuation of nitrate from aqueous solution using raw and surface modified biosorbents from Adansonia digitata fruit pericarp. Heliyon 2022; 8:e10004. [PMID: 35958265 PMCID: PMC9358469 DOI: 10.1016/j.heliyon.2022.e10004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 02/20/2022] [Accepted: 07/14/2022] [Indexed: 11/26/2022] Open
Abstract
The prevalence of nitrate in potable water is a serious environmental concern. Several methods for eliminating nitrate from water have been made and implemented. During the course of this research, raw (RADFP) and surface-modified fruit pericarp (SMADFP) biosorbents derived from the Adansonia digitata plant were applied in order to remove nitrate from an aqueous solution. The external features of the biosorbents were studied with the aids of SEM and BET. The FT-IR spectrometer was utilized for identification of the functional groups of the adsorbents. A UV-Vis device was used to quantify the nitrate concentration. The adsorbents under investigation exhibit a heterogeneous pore structure with a considerable number of mesopores, with surface areas of 361.527 and 379.877 m2 per gram for RADFP and SMADFP, respectively. FT-IR spectra revealed the presence of carboxyl, hydroxyl, carbonyl, and halogen groups on the adsorbent. The maximum nitrate removal efficiencies of RADFP and SMADFP were 64.55 and 88.95%, respectively. The maximum adsorption efficiencies are achieved when the pH is 2, the starting concentration is 27.50 mg/L, the contact period is 75.00 min, and the amount of biosorbent is 5.50 g. RADFP and SMADFP have a removal capacity of 12.45 as well as 25.18 mg per gram and adsorption intensity of 3.2300 and 5.4500, respectively. The investigational values for the elimination of nitrate ions concurred well to both Freundlich and Langmuir models with R2 values of 0.99917 and 0.99763 for RADFP and SMADFP, respectively, and pseudo-second-order kinetic model with R2 values of 0.99817 and 0.99947, respectively for RADFP and SMADFP. It can be concluded that SMADFP is a relatively better biosorbent than RADFP, which will be utilizable for the remediation of nitrate from an aqueous solution.
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Nguyen TT, Tran VAK, Tran LB, Phan PT, Nguyen MT, Bach LG, Padungthon S, Ta CK, Nguyen NH. Synthesis of cation exchange resin-supported iron and magnesium oxides/hydroxides composite for nitrate removal in water. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.11.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Amaly N, El-Moghazy AY, Sun G, Pandey P. Rapid removal of nitrate from liquid dairy manure by cationic poly (vinyl alcohol-co-ethylene) nanofiber membrane. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 282:111574. [PMID: 33187786 DOI: 10.1016/j.jenvman.2020.111574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 09/13/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Elevated levels of nitrate in surface water is a leading concern, which impacts human and animal health, and controlling it requires improved and sustainable methods capable of removing nitrate anions from source waste water to reduce nitrate anions transport to environment. In liquid dairy manure, nitrogen content can vary from 200 to 600 ppm and the transport of manure nitrogen into ambient water through hydrologic processes has a potential to exceed the maximum contaminant level limit (10 ppm) of nitrate nitrogen for regulated public water systems. Dairy manure is considered as a reservoir of nitrate. This research investigates on the determination of optimal designing of nanofiber membrane to remove nitrate anions from liquid dairy manure. A cationic poly (vinyl alcohol-co-ethylene) nanofiber membrane (EVOH) NFM was grafted via UV with 2-(methacryloyloxy) ethyl trimethylammonium chloride (DMAC) monomers. The adsorption efficiency of nitrate by the membrane was determined on liquid manure of dairy lagoons located in Central Valley of California. Initial nitrate concentrations in dairy manure varied from 75 to 100 ppm. Results showed that nitrate in dairy water was removed by 70% in 40 min. Tortuous structure and chemical stability of membrane resulted in nitrate dynamic binding capacity of 40 mg g-1. Furthermore, it exhibits efficient reusability without significant changes in its performance using 0.5 M sodium hydroxide solution for nitrate desorption. Results showed that change in pH, and multi-anion conditions had limited effects on nitrate removal efficiency, and EVOH NFM can be a viable option to remove nitrate of liquid manure. This could be used for mitigating transport of excess nitrate from manure to environment. Overall, the results suggest that EVOH-g-DMAC NFM is efficient, low-cost (13 USD/m3) and recyclable material for sustainable removal of nitrate from dairy manure wastewater without requiring any ionic strength or pH adjustment.
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Affiliation(s)
- Noha Amaly
- Department of Biological and Agricultural Engineering, University of California, Davis, USA; Polymeric Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt; Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, California, USA
| | - Ahmed Y El-Moghazy
- Department of Biological and Agricultural Engineering, University of California, Davis, USA; Polymeric Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt
| | - Gang Sun
- Department of Biological and Agricultural Engineering, University of California, Davis, USA
| | - Pramod Pandey
- Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, California, USA.
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Jiang Z, Wu J, Liu X, Yu H, Jiao C, Shen J, Pei Y. Facile synthesis of MgAl layered double hydroxides by a co-precipitation method for efficient nitrate removal from water: kinetics and mechanisms. NEW J CHEM 2021. [DOI: 10.1039/d1nj02035h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A series of MgAl-LDH as highly efficient adsorbents for removing low concentrations of NO3− were synthesized. The mechanism of NO3− removal has been comprehensively discussed in terms of its characterization, adsorption kinetics and thermodynamics.
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Affiliation(s)
- Zhuwu Jiang
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
- College of Civil Engineering
| | - Jiangnan Wu
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
| | - Xinru Liu
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
| | - Hai Yu
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
| | - Chengyuan Jiao
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
| | - Jyunhong Shen
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
| | - Yanyan Pei
- College of Ecological Environment and Urban Construction
- Fujian University of Technology
- Fuzhou
- China
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Abou‐Melha KS. Analytical Chemistry Optical Chemosensor for Spectrophotometric Determination of Nitrite in Wastewater. ChemistrySelect 2020. [DOI: 10.1002/slct.202001366] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Khlood S. Abou‐Melha
- Department of Chemistry Faculty of Science King Khalid University P.O. Box 9004 Abha Saudi Arabia
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Ogata F, Nakamura T, Toda M, Otani M, Kawasaki N. Evaluation of Nickel-Aluminium Complex Hydroxide for Adsorption of Chromium(VI) Ion. Chem Pharm Bull (Tokyo) 2020; 68:70-76. [PMID: 31902902 DOI: 10.1248/cpb.c19-00784] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, nickel-aluminium complex hydroxides at different molar ratios (nickel-aluminium = 1 : 2, 1 : 1, 2 : 1, 3 : 1, and 4 : 1, referred to as NA12, NA11, NA21, NA31, and NA41) were prepared, and their adsorption capability for chromium(VI) ion was investigated. Firstly, physicochemical characteristics (SEM images, X-ray diffraction (XRD) patterns, specific surface area, amount of hydroxyl groups, and surface pH) of nickel-aluminum complex hydroxide were evaluated. The amount of chromium(VI) ion adsorbed onto NA11 (15.3 mg/g) was greater than that adsorbed onto the other adsorbents. This research elucidated that the amount of chromium(VI) ion adsorbed using nickel-aluminium complex hydroxide was related to the adsorbent surface properties (r = 0.818-0.875). Subsequently, the adsorbent (NA11) surface before and after adsorption of chromium(VI) ion was evaluated, and chromium energy (577 and 586 eV) detected after adsorption onto the NA11 surface. These results revealed that the NA11 surface properties were very important for the removal of chromium(VI) ion from aqueous solution. In addition, the effects of pH, contact time, and temperature on the adsorption of chromium(VI) ion were evaluated. We confirmed a high recovery percentage of chromium(VI) ion when using sodium hydroxide solution at 10-1000 mmol/L (approximately greater than 80%) in this experimental condition. Thus, NA11 is a promising adsorbent for the removal of chromium(VI) ion from aqueous solution.
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Affiliation(s)
| | | | | | | | - Naohito Kawasaki
- Faculty of Pharmacy, Kindai University.,Antiaging Center, Kindai University
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Ogata F, Nagai N, Nakamura T, Kawasaki N. Adsorption Capability of Fe-HT3.0 for Nitrite and Nitrate Ions in a Binary Solution System. Chem Pharm Bull (Tokyo) 2019; 67:1168-1170. [PMID: 31582638 DOI: 10.1248/cpb.c19-00506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this study, the adsorption capability of Fe-HT3.0 for nitrite and nitrate ions in a binary solution system was evaluated. It was found that the amount of nitrite and nitrate ions adsorbed in a single solution (1.19 and 1.27 mmol/g, respectively) was higher than that in a binary solution (0.36 and 0.90 mmol/g, respectively). Equilibrium adsorption was attained within 6-24 h. The adsorption data were fitted to a pseudo-second-order model (correlation coefficient: 0.999), and indicated that the adsorption of both nitrite and nitrate ions is controlled by chemical sorption. Additionally, the binding energies before and after the adsorption of nitrite and nitrate ions in the binary solution system were measured. After adsorption, new nitrogen peaks (approx. 399 and 403 eV) were detected. The results of this study show the potential of Fe-HT3.0 for the removal of nitrite and nitrate ions from aqueous solution systems.
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Affiliation(s)
| | | | | | - Naohito Kawasaki
- Faculty of Pharmacy, Kindai University.,Antiaging Center, Kindai University
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Altowayti WAH, Allozy HGA, Shahir S, Goh PS, Yunus MAM. A novel nanocomposite of aminated silica nanotube (MWCNT/Si/NH 2) and its potential on adsorption of nitrite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:28737-28748. [PMID: 31376124 DOI: 10.1007/s11356-019-06059-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 07/22/2019] [Indexed: 05/05/2023]
Abstract
Several parts of the world have been facing the problem of nitrite and nitrate contamination in ground and surface water. The acute toxicity of nitrite has been shown to be 10-fold higher than that of nitrate. In the present study, aminated silica carbon nanotube (ASCNT) was synthesised and tested for nitrite removal. The synergistic effects rendered by both amine and silica in ASCNT have significantly improved the nitrite removal efficiency. The IEP increased from 2.91 for pristine carbon nanotube (CNT) to 8.15 for ASCNT, and the surface area also increased from 178.86 to 548.21 m2 g-1. These properties have promoted ASCNT a novel adsorbent to remove nitrite. At optimum conditions of 700 ppm of nitrite concentration at pH 7 and 5 h of contact with 15 mg of adsorbent, the ASCNT achieved the maximal loading capacity of 396 mg/g (85% nitrite removal). The removal data of nitrite onto ASCNT fitted the Langmuir isotherm model better than the Freundlich isotherm model with the highest regression value of 0.98415, and also, the nonlinear analysis of kinetics data showed that the removal of nitrite followed pseudo-second-order kinetic. The positive values of both ΔS° and ΔH° suggested an endothermic reaction and an increase in randomness at the solid-liquid interface. The negative ΔG° values indicated a spontaneous adsorption process. The ASCNT was characterised using FESEM-EDX and FTIR, and the results obtained confirmed the removal of nitrite. Based on the findings, ASCNT can be considered as a novel and promising candidate for the removal of nitrite ions from wastewater.
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Affiliation(s)
| | - Hamzah Gamal Abdo Allozy
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
| | - Shafinaz Shahir
- Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
| | - Pei Sean Goh
- Advanced Membrane Technology Research Centre, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia.
| | - Mohd Amri Md Yunus
- Division of Control and Mechatronics Engineering, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
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Ogata F, Nagai N, Toda M, Otani M, Nakamura T, Kawasaki N. Evaluation of the Interaction between Borate Ions and Nickel-Aluminum Complex Hydroxide for Purification of Wastewater. Chem Pharm Bull (Tokyo) 2019; 67:487-492. [PMID: 31061375 DOI: 10.1248/cpb.c19-00037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new mixed metal hydroxide adsorbent (NA11, molar ratioNi-Al = 1 : 1) was prepared and its physicochemical properties (specific surface area, amount of hydroxyl group, scanning electron microscopy images, X-ray diffraction analysis, elemental distribution, and binding energy) were studied. In addition, the amount of borate ion adsorbed using several adsorbents, including NA11, was evaluated in this study. The specific surface area of and amount of hydroxyl group in NA11 was greater than those of the other studied adsorbents. The amount of borate ion adsorbed showed similar trends to those of the specific surface area and number of hyrdroxyl groups, which indicated that the adsorption mechanism of borate ion was related to the specific surface area and the amount of hydroxyl group. After adsorption, the binding energy of boron B(1s) peaked, and the sulfur peak intensity S(2s) and S(2p) reduced. These results suggest that ion exchange between borate and sulfate ions was one of the adsorption mechanisms. Equilibrium adsorption was reached within 6 h in the case of NA11. These data were fitted into a pseudo-second-order model (r = 0.813-0.998). The solution pH affected the capacity of NA11 for adsorbing borate ion from aqueous solution. It was found that adsorbance was greatest at pH 10. Adsorption isotherm data were fitted to both the Freundlich (r = 0.986-0.994) and Langmuir (r = 0.997-0.999) isotherm equations. Collectively, it is suggested that NA11 is prospectively useful for the adsorption of borate ion from aqueous solutions.
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Affiliation(s)
| | | | | | | | | | - Naohito Kawasaki
- Faculty of Pharmacy, Kindai University.,Antiaging Center, Kindai University
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